Udemy - Advanced javascript Programing For Modern Web Developer 2015 TUTORiAL | 605 MBjavascript is a programming language that used to make web pages interactive. It runs on your visitor's computer and doesn't require constant downloads from your website. It is lightweight and most commonly used as a part of web pages, whose implementations allow client-side script to interact with the user and make dynamic webpages. javascript was first known as LiveScript, but Netscape changed its name to javascript, possibly because of the excitement being generated by Java.